<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      action="#"
      list-type="picture-card"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }"
      :on-change="handleFileChange"
      :auto-upload="false"
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import { fileUpload } from "@/api/system/user";
import { isExternal } from "@/utils/validate";

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: false,
    },
    params: {
      type: String,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: "https://zuowan.oss-cn-beijing.aliyuncs.com", // process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/third/system/file/upload", // 上传的图片服务器地址
      fileList: [],
      files: [], // 新选择的图片数组

      localList: [], //需上传的图片数组
      urlList: [], //图片url数组
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");

          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            // this.urlList.push(item);
            console.log(this.urlList);
            if (typeof item === "string") {
              // if (item.indexOf(this.baseUrl) === -1) {
              //     item = { name: this.baseUrl + item, url: this.baseUrl + item };
              // } else {
              item = { name: item, url: item };
              // }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  mounted() {
    this.urlList = this.value;
    console.log(this.params, this.urlList);
    let paras = this.params;
    let dict = {
      params: this.urlList,
    };
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
      this.updataArray(file, fileList);
    },

    // 图片改变时候调用
    handleFileChange(file, fileList) {
      this.updataArray(file, fileList);
    },

    updataArray(file, fileList) {
      this.urlList = [];
      this.localList = [];
      fileList.forEach((item) => {
        if (isExternal(item.name)) {
          this.urlList.push(item.name);
        } else {
          this.localList.push(item);
        }
      });
    },

    // 图片上传给后台
    uploadImages(resolve) {
      let proArr = [];
      console.log(this.localList);
      if (this.localList.length) {
        this.localList.forEach((item, index) => {
          let formdata = new FormData();
          formdata.append("file", item.raw);
          formdata.append("score", 4);

          proArr[index] = new Promise(function (resolve, reject) {
            fileUpload(formdata)
              .then((response) => {
                console.log("图片上传成功", response);
                resolve(response.data.url);
              })
              .catch(function (error) {
                reject(error);
              });
          });

          Promise.all(proArr).then((res) => {
            this.urlList.push(...proArr);
            this.$emit("uploaded", this.urlList);
          });
        });
      } else {
        this.$emit("uploaded", this.urlList);
      }
    },

    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },

    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url.replace(this.baseUrl, "") + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>

